1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

What octane are u running ?

Discussion in '3rd Gen. Tacomas (2016-2023)' started by GOTSAND?18, Dec 2, 2018.

  1. Dec 7, 2018 at 10:08 AM
    #221
    shakerhood

    shakerhood Well-Known Member

    Joined:
    Aug 9, 2015
    Member:
    #161370
    Messages:
    36,326
    Gender:
    Male
    Southern Ohio
    Vehicle:
    2017 MGM DCSB Off Road, 6 Speed MT, P&T
    Right, I aware of how it works.
     
  2. Dec 7, 2018 at 10:22 AM
    #222
    US Marine

    US Marine Semper Fi

    Joined:
    Mar 24, 2016
    Member:
    #182227
    Messages:
    14,691
    Gender:
    Male
    First Name:
    Chuck
    Gallatin Tennessee
    Vehicle:
    02 Pre Runner supercharged 4cyl
    TRD supercharger , Doug Thorley header , K&N CAI 265/75-16 Toyo open country mud terrain , 15x8 Method Racing wheels , Rancho 3" lift , 4.88 gears , Detroit Locker
    Yes taking a Auto trans and placing it in neutral going at speed down a hill is dangerous . Internal transmission components are turning 3x's the rpm you see on your tach

    I've seen and witnessed major damage done to a transmission by freewheeling (putting the transmission in neutral) at cruising speeds . I've seen transmission cases literally explode along with internal parts coming thru the firewall and floorboards severely injuring the occupants !!!
     
    Last edited: Dec 7, 2018
    shakerhood and BSFord[QUOTED] like this.
  3. Dec 7, 2018 at 11:35 AM
    #223
    darncart

    darncart Well-Known Member

    Joined:
    Jan 8, 2016
    Member:
    #174398
    Messages:
    116
    Gender:
    Male
    I started out in this thread just posting my real world test results since it happened to be recent and relevant to the discussion. Seems like a lot of people who have run both have had similar results. Yes... I have seen a few posts of people who have run both, or even ALL the grades and didn't notice a difference. But there a more that have done the testing and shown a difference. And then there are people who come in here and basically call those people insane (in so many words). I did the test to see if I could switch to 89 and save some $$. Based on my results, I will stick with premium.

    The engine revs very high when coasting down steep hills IN GEAR and speeds go much higher than 30 MPH (which is most of the time on long steep hills). It's difficult to conceive that there is NO fuel being consumed in that situation, but I will concede that I was able to easily find evidence that this is true. However, even if the engine continued turning without fuel, the difference would be almost imperceptible. The MPG maxes out for both IN GEAR and Neutral, and the idle fuel consumption for 30 seconds or even a minute has to be less than a lung full of fumes. Speed increases at a much faster rate in Neutral than IN GEAR as well and throughout all fazes of hill descent (unless you give it gas while engaged). In addition, longer steeper hills (typically where i would use Neutral) can give you speed faster and lack of compression that allows you to coast further as the grade starts to level out, allowing to avoid accelerating sooner. Often on "double hills" (I have a 1 mile double hill between me and a nearby mall and a watering hole where I watch football), I've coasted down and over the next hill without depressing the pedal. When left in gear, the compression keeps me at a slower speed. This effect increases as you level out, and you need to depress the gas to maintain speed. All this results in a net savings for longer, steeper hills. And if you do it over and over again, how many turns do you think you can you save on your engine in a year? The drawback I think is the risk in engaging the engine at a high speed where the RPMs are going engage at a high rate too quickly and possibly damage a gear or other parts in the transmission.

    Another poster mentioned it's as bad as towing a 4x4 while in 4WD. How is it worse than idling while sitting in your driveway? Neutral means all wheels can spin freely with no hindrance. I'm guessing all the magic ECU adjustments that are in effect while IN GEAR are suspended while in Neutral. There's good and bad in this.

    Either way, this discussion has encouraged me to think twice about coasting in Neutral. And I may very well think a third time the next time I go to do it. The risk is not worth whatever over-all reward.

    Despite ALL that! I absolutely did get a 2 MPG loss switching from 91/93 to 89 octane (NOT 87). And my results are what they are. Maybe that's just my truck, my altitude, my hills, my city. I think everyone would get slightly different results. The engine is less stressed on premium, and I experience a fair increase in performance that results in about the same cost as running 89 octane if not a really minuscule savings. WORTH IT!

    I'll probly re-test next summer, as my test was in the fall after the switch to crappy fuel. I had already dropped from 19/20 MPG down to 18-ish before starting my test. Summer may be a completely different story.
     
  4. Dec 7, 2018 at 11:52 AM
    #224
    cramey74

    cramey74 Well-Known Member

    Joined:
    Oct 15, 2018
    Member:
    #269485
    Messages:
    78
    Gender:
    Male
    Stock for now


    I for one, never doubted your claim that you get better fuel mileage with higher octane fuel. My argument is that it has less to do with octane and more to do with a batch of fuels consistency and stability. This is why I recommend a more scientific approach by actually measuring the specific gravity batch to batch and against other fuel qualities. Maybe the fuel you are getting from the lower octane sump is tainted and causing a performance issue vs the fuel in the higher octane sump having less impurity and being more stable. I’m not even saying that your Tacoma won’t burn the higher octane offerings. The lowest octane that the engine can use and most stable (batch to batch) will yield the best result.
     
  5. Dec 7, 2018 at 12:44 PM
    #225
    GTS Bruce

    GTS Bruce Well-Known Member

    Joined:
    Mar 26, 2014
    Member:
    #126259
    Messages:
    255
    Gender:
    Male
    First Name:
    W
    Only CAM 2 used here. 100 octane with approximately 9% ETOH. More power,better mileage,better drivability than 87? and Its only $7.98 a gallon in my area. Nope no difference than 87. Vehicle not designed for it.
     
  6. Dec 7, 2018 at 12:54 PM
    #226
    stun gun

    stun gun Well-Known Member

    Joined:
    Nov 18, 2016
    Member:
    #202729
    Messages:
    14,049
    Gender:
    Male
    First Name:
    Aaronski
    Vehicle:
    Tacomas.
    17 4X4 sr5spd/01 LT sr5spd
    Ever since hector showed up with those spoon engines, nothing has ever been the same.
     
    JustJon likes this.
  7. Dec 7, 2018 at 1:06 PM
    #227
    Hank Heel

    Hank Heel Well-Known Member

    Joined:
    Sep 18, 2016
    Member:
    #197637
    Messages:
    1,645
    Gender:
    Male
    WA
    That’s what doesn’t make sense, homie was going legit, not sure why he needed them 3 spoon engines
     
    JustJon and stun gun[QUOTED] like this.
  8. Dec 10, 2018 at 8:22 PM
    #228
    Rick's 2012

    Rick's 2012 Well-Known Member

    Joined:
    Dec 11, 2017
    Member:
    #238253
    Messages:
    2,461
    Gender:
    Male
    First Name:
    Rick
    Costa Rica
    Vehicle:
    2012 Double Cab 4x4 Grey with leather
    Stock
    I use Super 91 octane. Because every mechanic around here that l asked, warned me about the quality of the lower octane fuels. Whenever l meet another mechanic l keep asking the same question. So far they've all recommended that I used Super.
     
  9. Dec 12, 2018 at 4:26 AM
    #229
    mfalbojr

    mfalbojr Well-Known Member

    Joined:
    Dec 13, 2017
    Member:
    #238376
    Messages:
    66
    Gender:
    Male
    Kansas City, MO
    Vehicle:
    2017 TRD Sport Super White
    I drive 320 miles on the highway every other weekend. With 87 octane I get 19.4 mpg. With 91 octane, I get 23.9 mpg and I think the truck might feel a little stronger. The bottom line is that yes it performs better, but not enough to cover the price of the 91 octane. Worth noting that I do 75 mph most of this trip. I have tried doing the speed limit and accelerating slowly and my numbers went up a lot, but I don't have the patience for that.
     
    bamaironman likes this.
  10. Dec 12, 2018 at 4:53 AM
    #230
    eMKay

    eMKay Well-Known Member

    Joined:
    Sep 15, 2018
    Member:
    #266353
    Messages:
    375
    Gender:
    Male
    First Name:
    Michael
    Buffalo, NY
    Vehicle:
    2019 Cavalry Blue DCOR 6MT
    Pro Grill, roof rack, HID headlights, yellow fogs, LED high beams, trailer brake controller
    But it is tuned to take advanage of higher octane fuels, just like every other 2gr. If it’s worth the extra cost or not, that’s up to others. One of my jobs is working in a marina, there are two gas stations nearby that carry 90 no ethanol, so I use that a lot. I use it exclusively in my motorhome and one of my boats (the other runs on diesel) because they sit a lot. Also use it in the snowblower for the same reason.
     
    TRD_INFERNO likes this.
  11. Dec 12, 2018 at 3:14 PM
    #231
    Rooster OG

    Rooster OG Well-Known Member

    Joined:
    Nov 17, 2017
    Member:
    #236265
    Messages:
    222
    Gender:
    Male
    First Name:
    Tom
    Northern California
    Vehicle:
    Cement 2018 TRD Off Road M/T

    Higher octane fuels work fine, I never said they wouldn’t work, you just don’t get any real gains from it. If you look at the OVTune and the benefits you get from their 91 octane tune, that’s what I meant. The factory tune doesn’t give you the benefits of higher octane gas like a tune mapped for it will.
     
    BSFord likes this.

Products Discussed in

To Top